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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568c1fe255119e9e13fcddc225a00ad651bd58ea102c6b1d3da15bff0228bd03' 
  AND token = '50Rb/I3G77U3FiJZ9ltY8oj2miWFiXu+CZ5AnNSdryA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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