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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b068dcafb20e769dedddbb28ad712d63ceac9ff8ba9255ec6294807e15d59f1' 
  AND token = 'X3reU9yFlZ8dfPty7dZJ+6VOYv5urIwSV6u1hfIPw1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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