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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6bef2475ae51ef158167d3bf0b91c8287271e805023d3e037d7f141f719197' 
  AND token = 'Q359s07GyPW3CQ98DmYIL2OQmBa5ZX8zTaRC99y+Uik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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