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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77853bc32162009c1e078640c289959a076383be613e255ee9c3934871537bf' 
  AND token = 'NL6d5Ysc3iVUnyVoaxTDYrR0jR5FK4BQKHeH0YUgb+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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