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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9380018b60c095b0ead945d4ddc04d0ddc297068b3053f59ca509099d14e6d75' 
  AND token = 'T/v3hi7urZD05ACrA+tK1EuCQU1wRkHttFekpERHrls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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