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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dbc9d188c3e908a426b03fea778085037df833e5f0de2bbc9f5330b5953607' 
  AND token = 'pdj+kJhYSszfg+vtfUjhPVchBI0Twf+EMwy9+v29B+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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