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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd124e1de0d34ba04f6669f66ea8e32d62f55dd6c4d3dca79cce5f347ec6ab1a0' 
  AND token = 'E+EGAr2/AFAwMYy7Rl2wtMBowVI8OVWebFUFncpICPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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