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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ffe9108ce78b543671d57c6fe8ed956f17a26f578733c8f5633eeb17d9e70d' 
  AND token = 'L6Ks9RF/81zRFQo+kfM86M5tzbvSEXw12YnXgLH+qac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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