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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6037db36b9735d8bc177a061c71120530038e6420eb41589aa6b5d05aa4b70' 
  AND token = 'L1eUd6hiXMB8AA0mmCDg2uOGZ/hPniil5HjANm6Maj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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