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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673d0b33f2e447b78be4c52a68df9c59a5e71e7e0b7c6e7a0bf62df38d2fb8e2' 
  AND token = 'LNNht/Bj3ccv+eeSqclM0PMIAyDFUk2hemK/Ed+hoCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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