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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f65918d86bafd7e2cac15126410ee05f6985797da0796a14f2b618384fc25d5' 
  AND token = 'l6ZMFL91sfLdMklKQ+50g4M0BYaQ8C4bo8gDkU5YlOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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