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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e671c13463f7082fb8d42eb8393f2768612cd753b80637d4a19f7f92ce3b6e0' 
  AND token = 'dh2N4JK0aViEuZNaUWPHDi58gOf30EfmZshwqvleSYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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