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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13618054dc99e51f8da1c7be19099597f40444496461cebfa2e9c7e2d35e008' 
  AND token = 'yNSCzK/C45kA1gY/NCtIGPVZbBT1cF3dvqlEBqRvZsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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