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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4893620d566b5d399b57682ac786149b25b2c39d4257318a608dd8f033091dc7' 
  AND token = 'LthPXb9Ck+CUAcmIfo0CviHAdPPFDvwDKrQ6ABgA/7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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