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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebc93b17c9a96b148691a89ef428592497318f553e6bbc77cc8068bf1bdff89' 
  AND token = 'XGA2U3321qedzWaWW+hY8NPFYn5nCLAdsqHogJtvs2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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