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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dead304fbcf31d2e066854c9d15d0a85db839b52e6546bba977670bf06364f' 
  AND token = 'bXXaV8mJasacjRKwAgdowNqIyNT7e+lA6nuo3QqyiBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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