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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc3c06daa17f2492ee721691b633438fa221b5310a5cd28e63c94fbfd31c16e' 
  AND token = 'orjfaR5PGSNfDJcUCs3/2UsVj3loIPGPm5rEMBmDiAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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