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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7119935c6c1c0d2c3dd4543e36032052c0e5c8998e6b9e291cde4eab39289a80' 
  AND token = '2yaM8CIH6CWiz13JAel/xL4UrMnOmdjK0PFecjij2ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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