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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1af98ef926c159e0c32088e3942e31bc82edeb8ea69dad7e9388d700611f7d2' 
  AND token = 'jTYTDZBurAhAGc/WIZev1BtS/tbE2+J09MZ4cUFVbio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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