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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97655c0ba6de287133de41fc3c5e1c8708c07ba8b52117b5c0e179b1ff848e1' 
  AND token = 'qz9lYDSr7m817c3Jah9b10IY40alkevqrnlBjuaMVMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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