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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62e6c94b8040da2efff15911d8d04ad8f5d5b47ec4e29b4d35e1ddbc14b690a' 
  AND token = 'fx4mJIKLvFmS3O/Jvf3EAJqRvzuvwCX1OcXn0nf9+tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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