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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e00f2f534bc50729a2c9ef71da7fa7eadc45a02a0bdbae126fe60a48ca1659' 
  AND token = 'hBNKh2tTErr97z3ne+cRjAsv6cw2sYHV3VehofQktlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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