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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a1524e1f91d1c8e74d7244b179cb2d283276c8d578f3b1ff2cdc4734f81c7f' 
  AND token = 'SfQ9xWHEFL/EIct1JNcOKBvioRPXDUTQ3Ah8Teg83IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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