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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baadd47f05adff0be13598a10d49bd3d5b5dfd4fe2e6082193867ecb54ef1d0d' 
  AND token = 'gz60Qo8CZvlsQI9XkMuNzhpNv1KSaYSdyq6k7bx9nSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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