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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bf2397db665bd07d935706f3a62a01a60108a0a3d673032a968d3bd0ace98d' 
  AND token = 'evU9dRoCjqnyco1pCS87xgL6fLPG2w+HIf8cKsYDrsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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