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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e0e1060e84f6887ddc336480e7cb9a3633283a6928689a09b836ba5071a73a' 
  AND token = 'jAe9hCeD0g3gMz8SI6JdVU7UsHhBWCdVnMf9N9W/qLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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