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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c7dcb342ce6c3cb2f5c80d2f925eb55cb0b9f15eee5961cc1ce4a334a29139' 
  AND token = 'qdZPEWtBPmY63IZjbWOCW+01gJGmj1OZS86zn54EFnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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