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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a62b0e8bbc3b25e5c8ab73f6bfdedf27e856baa505978df80ed3e5893d7bd4a' 
  AND token = '25y9RetUfItPszp6/+LmzRTqHCj4xS9vj2B5eKYYtxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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