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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fc435454a3fab490835f800aa05485680fbf3ef1c2d29e97db9df04312c07e' 
  AND token = 'T79/uyPpiAMM1+FaV0JjYvZCxiPevTiToxI/D65Upaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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