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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae27cfaffe65d1af9b138f57b00e6d75f5d711dcd0c93dc93f40283c0a6e2dc' 
  AND token = '+KPK8boNzwcpu7ONnKBp0kNTHGkkDCRykI/MsHju1jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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