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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691354df39587ffe7b810c3d5876c8ae905748abcb9e19998b50ffad50539b06' 
  AND token = 'eFiakqUH9xXUzo1f7F+tAOq9w1QQ4eUftaaWkOPtFuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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