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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10c62ec883db786a30cf6bbf3a4b518d5637ebf6d0cbbb334623db661dfc5b9' 
  AND token = 'GAzvuZPeNioNx/r6XqN/nM0vlm5hetI7DzVX2UVy/nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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