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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de45dffbc38e399b90c502b520dea98d9328338cc8fe702e8b0ab035e004bcef' 
  AND token = '/JHHKm5Y8NdW3lA04odrqHcWamcicN4FHNMxf2E61to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}