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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd11d7c18aa1106e2bbb9639ec0ef9b061dd7d14aa7d0e95c024681f90bc0a75' 
  AND token = 'YclbUbZZUnyvzWE+YfZabG2TdXeROmdCuaUVj4ArMcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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