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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7a518d7a5c4a1d622e9e183adc3aaab11e78fb49e428d1b981af4eb391b19c' 
  AND token = 'goMhCF/DgWk7XP/oeBDaY0EUfZZ1HwdBaT43T0wsFgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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