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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f6f4d9a09481dc7a89604c9d7cba1bfcecc700ef5de4e9a16e6d051b85c0b9' 
  AND token = '5V/lJsMEXfB4yB5C1QAPgU1uG9GIGsymqYxPldXbU8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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