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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97caa16b73a1ee71dc9dcabdaf9f7c18320c5a1d4d7b55deb3e26a4968e780cd' 
  AND token = 'BmzLGErMEtoBP2dNJyeDTp1uXw6+hVogAFDtzX1CNNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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