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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979e3e640f0f1576388a931f93c5d47d37ba2514a105f077908011afa710be05' 
  AND token = 'NUVGdOQLjUktipFyrwmnf/CiZWQIn0CugWUgQu06LkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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