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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39a9d82dea7acf96283eda61f298ee55b9cf5f4b7a76071352f4f16b04929e1' 
  AND token = 'CQtweKSN9UVXIna5AXDp9MYdCkP091tEg5Ne64x5dXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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