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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c3478058ad1d9e26d51766996aee0128ea81ca6fb93ca496c53539592ad9f0' 
  AND token = 'zhd1oMFcUenoFc8EYCvcJB2K92w3+FDUN+i38HA8Exk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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