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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2098df2c4f152db1605b224b3abdc42339d3928f8ea25f04e298677359672188' 
  AND token = 'Ko+Zyi2L5HKHSC6L7gszZrFQ6Z/HrHxFlyP9w0zHzF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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