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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dc7bc748ad2f3395804e6935334c7a633ecbd49cdf0bdacc1f6c16ca7d1fc0' 
  AND token = '9xufHUThCg+ClgdFXg4vVEhcEBlCg+7n7JqaMtN9Rlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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