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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d109b1466ab33880e4cea433094d39f946e61e38dc5a483143df1038526e23' 
  AND token = 'yQKVCYM0B//NDSf3osxmsM8XxQ1A5REBhhm8R7YAol8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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