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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c4e3e9cf70ee6940c67e807e7ab68d94a2ac3271df0c2263913d4d74581de7' 
  AND token = '2qg3APVK8xwhvXtZr0lY3DRjJuZpaoJu1O97Vd5Q44U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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