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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a147b603c8a74b2bcb530164b53cb6e511835acbe3ac9194ec15cdf707ea3a' 
  AND token = 'k488c8SZ7DpGwcd0SmMibWctgNBAOLCPcVa+PYaHDhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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