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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7844ca8fce70acf7621dbc8a869d922c098192a520ab80fd680f94363dce336d' 
  AND token = 'h37PeOZyr099kcqH12rB6Iz9z6AP2zxl677BTs4lrws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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