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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832d973e6d619eb900076c2381ccb48bb62250c782474264d3011c099d7ddff3' 
  AND token = 'McLPJOjlmeKoYBPWVgPe5Jd/dK0uKPCLc8L9hssdm/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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