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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee04e9f2683fd0e273997dacf64d2ad1ec4d004879f225fe8f3117dff890503' 
  AND token = '0t68LUJ5Zy+f+L75HAqVP7tZR1oscbsi/VLou2FtPuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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