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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89109fd2e7e2a86f32fa8f7d19c365c520516041f7746e025aabfeb1b193003' 
  AND token = 'A/7w+sb3fXhWjOnS7FpzkNBahlTG9f0B39P2Q9oaPis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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