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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86509df538a1f9238a9b0fbf0a03b4979a3aaf2f41552797f3b49819b0f853eb' 
  AND token = 'awMhG8HO9sxk4cI3NisVNfYQDCvl3XUe43YWbSVSjxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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