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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9089ebb6698d54ee463667b9e3e4932250b762ab69084fb06972cadee0cacca' 
  AND token = 'Z+2+ults+r/IoOzylODP6E0AxQdCYAef/EHE9vX3uQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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