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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c759bdacb14ff0aee4a794d94465a0658d108be78f7a6bb745e4960692244b' 
  AND token = '7vhNgn9ccBNy+jYWINHYfTID+3DG71YSB1xZmW8nP30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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