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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2eadafb333f288aafa94a101b043f98d04210d6c74c4e563914a8ca77be2f5e' 
  AND token = 'zmubS2xxY41jJ9Q0Waj0VdZrJ2KKVHEmhm60Bw+YTMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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