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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fca9662c35c14e78a2b0d7ff9386c418f7e946813c7a6ca527d4627c7b442e' 
  AND token = 'ApaiSMgIgfstkGRdfuC7emBLWgpFS7YjT6Qopr4z8Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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