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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7552a1e23d98c6c4918c8b78a1eb8fd8ca0e2dc71ad71fbed3b2ae6c277e3d73' 
  AND token = 'D7lMrNd+VgqxE2au3l3PuEgZew0D4aU/7vSMQ4SLfjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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