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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aca732ed629796e3f7ce0e2875cddfa8c78b454dee37f554a9c1a6c95453c49' 
  AND token = 'A5zZWqqcNZfNPXW2WntwApocC1aipHLWKXg6aqKZ+Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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