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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62afe5dc3fa711e3a2d584abe1bb948324d2ea00f336bfb6f3bc3dd086c7d38' 
  AND token = '/kho0b5Usy/K14DHxaPCutYL3gljrmAr9S21V+q31o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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